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This map shows the estimated location of the Mars Exploration Rover Spirit within Gusev Crater, Mars. Engineers targeted Spirit for the center of the blue ellipse. Measurements taken during the rover's descent by the Deep Space Network predicted its landing site to be the spot marked with a black dot. Later measurements taken on the ground by both the Deep Space Network and the orbiter Mars Odyssey narrowed the predicted landing site to a spot marked with a white dot. When initially choosing a landing site for the rover, engineers avoided hazardous terrain outlined here in yellow and red. This map consists of data from Mars Odyssey and Mars Global Surveyor.